Four mounting screws are included with your heater. If you wish to be able to easily remove your heater during boating season, consider our quick-release mount. Whether mounting your heater permanently, or with our quick-release mount, be sure to choose a mounting location that is above any potential areas of standing water in the bilge. For boats with a stern drive we would like to see the heater mounted towards the back of the compartment blowing to the out drive and the back of the motor. For boats with V Drives, air should be directed toward the transmission/rear of engine. On inboard powered boats, direct the airflow toward the rear of the motor and transmission.